Nested field access on nullable structs discard parent nulls

[AdamGS]

Describe the bug

If we have a nested struct array, we only take the leaf nullability into account, instead of of an AND of all parent nullability.

To Reproduce

let inner_array = StructArray::new(
        vec![Field::new("value", DataType::Int32, false)].into(),
        vec![Arc::new(Int32Array::from(vec![1, 2, 3]))],
        None,
    );
// Only the outer struct marks row 1 as null; its children are all valid.
let outer_array = StructArray::new(
        vec![Field::new("inner", inner_array.data_type().clone(), false)].into(),
        vec![Arc::new(inner_array)],
        Some(NullBuffer::from(vec![true, false, true])),
    );

If we try and get outer['inner']['value'], we currently get [1, 2, 3] instead of [1, null, 3].

Expected behavior

No response

Additional context

No response

[AdamGS]

take